Examples of QueryEngine

com.hp.hpl.jena.query.engine1.QueryEngine
it.unimi.di.big.mg4j.query.QueryEngine
it.unimi.dsi.mg4j.query.QueryEngine
An engine that takes a query and returns results, using a programmable set of scorers and policies.
This class embodies most of the work that must be done when answering a query. Basically, {@link #process(String,int,int,ObjectArrayList) process(query,offset,length,results)} takes query,parses it, turns it into a document iterator, scans the results, and deposits length results starting at offset into the list results.
There however several additional features available. First of all, either by separating several queries with commas, or using directly {@link #process(Query[],int,int,ObjectArrayList)}it is possible to resolve a series of queries with an “and-then” semantics: results are added from each query, provided they did not appear before.
It is possible to {@linkplain #score(Scorer[],double[]) score queries} using one ormore scorer with different weights (see {@link it.unimi.dsi.mg4j.search.score}), and also set {@linkplain #setWeights(Reference2DoubleMap) different weights for different indices} (they will be passed to the scorers). The scorers influence the order when processing each query, but results from different “and-then” queries are simply concatenated.
When using multiple scorers, {@linkplain #equalize(int) equalisation} can be used to avoid the problem associated with the potentially different value ranges of each scorer. Equalisation evaluates a settable number of sample documents and normalize the scorers using the maximum value in the sample. See {@link it.unimi.dsi.mg4j.search.score.AbstractAggregator} for some elaboration.
{@linkplain #multiplex Multiplexing} transforms a query q into index0:q | index1:q …. In other words, the query is multiplexed on all available indices. Note that if inside q there are selection operators that specify an index, the inner specification will overwrite the external one, so that the semantics of the query is only amplified, but never contradicted.
The results returned are instances of {@link it.unimi.dsi.mg4j.search.score.DocumentScoreInfo}. If an {@linkplain #intervalSelector interval selector} has been set, the info field will contain a map from indices to arrays of {@linkplain it.unimi.dsi.mg4j.query.SelectedInterval selected intervals}satisfying the query (see {@link it.unimi.dsi.mg4j.search} for some elaboration on minimal-interval semantics support in MG4J).
For examples of usage of this class, please look at {@link it.unimi.dsi.mg4j.query.Query}and {@link it.unimi.dsi.mg4j.query.QueryServlet}.
Warning: This class is highly experimental. It has become definitely more decent in MG4J, but still needs some refactoring.
Warning: This class is not thread safe, but it provides {@linkplain it.unimi.dsi.lang.FlyweightPrototype flyweight copies}. The {@link #copy()} method is strengthened so to return an object implementing this interface. @author Sebastiano Vigna @author Paolo Boldi @since 1.0
ivory.sqe.retrieval.QueryEngine
net.fortytwo.ripple.query.QueryEngine
two.net)
org.apache.cayenne.access.QueryEngine
Defines methods used to run Cayenne queries.
org.apache.clerezza.rdf.core.sparql.QueryEngine
A QueryEngine can process SPARQL queries against an arbitrary set of graphs. @author rbn
org.apache.jackrabbit.core.query.lucene.join.QueryEngine
org.apache.jackrabbit.oak.api.QueryEngine
The query engine allows to parse and execute queries.
What query languages are supported depends on the registered query parsers.
org.apache.jackrabbit.oak.query.QueryEngine
org.apache.xindice.core.query.QueryEngine
QueryEngine is the Xindice Query Engine. Its purpose is to orchestrate query operations against the Xindice repository. The QueryEngine basically just manages a set of QueryResolvers that actually perform the work.
org.jboss.dna.graph.query.QueryEngine
A query engine that is able to execute formal queries expressed in the Graph API's {@link QueryCommand Abstract Query Model}.
org.modeshape.jcr.query.QueryEngine
@author Randall Hauch (rhauch@redhat.com)

Examples of org.apache.jackrabbit.oak.query.QueryEngine

    private final QueryObjectModelFactoryImpl qomFactory = new QueryObjectModelFactoryImpl();
    private final QueryEngine qe;


    public QueryManagerImpl(WorkspaceImpl workspace, SessionContext<SessionImpl> sessionContext) {
        MicroKernel mk = sessionContext.getMicrokernel();
        qe = new QueryEngine(mk);
    }

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Examples of org.apache.xindice.core.query.QueryEngine




    public Database() {
        super();
        docCache = new DocumentCache();
        engine = new QueryEngine(this);
        closed = true;
    }

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Examples of org.jboss.dna.graph.query.QueryEngine

             */
            public QueryResults execute() {
                Batch batch = batch();
                TypeSystem typeSystem = getContext().getValueFactories().getTypeSystem();
                QueryContext context = new GraphQueryContext(schemata, typeSystem, hints, problems, variables, batch);
                QueryEngine engine = getQueryEngine();
                return engine.execute(context, query);
            }
        };
    }

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Examples of org.jboss.dna.graph.query.QueryEngine

                // Submit the batch before the processing the query. No need to hold onto the batch results,
                // because each ProcessingComponent holds onto its AccessQueryRequest ...
                ((GraphQueryContext)context).getBatch().execute();
            }
        };
        return new QueryEngine(planner, optimizer, processor);
    }

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Examples of org.modeshape.jcr.query.QueryEngine

                                   Schemata schemata,
                                   RepositoryIndexes indexDefns,
                                   NodeTypes nodeTypes,
                                   PlanHints hints,
                                   Map<String, Object> variables ) {
        final QueryEngine queryEngine = queryEngine();
        final QueryContext queryContext = queryEngine.createQueryContext(context, repositoryCache, workspaceNames,
                                                                         overriddenNodeCachesByWorkspaceName, schemata,
                                                                         indexDefns, nodeTypes, new BufferManager(context),
                                                                         hints, variables);
        final org.modeshape.jcr.query.model.QueryCommand command = (org.modeshape.jcr.query.model.QueryCommand)query;
        return new CancellableQuery() {
            private final Lock lock = new ReentrantLock();
            private QueryResults results;


            @Override
            public QueryResults execute() throws QueryCancelledException, RepositoryException {
                try {
                    lock.lock();
                    if (results == null) {
                        // this will block and will hold the lock until it is done ...
                        results = queryEngine.execute(queryContext, command);
                    }
                    return results;
                } finally {
                    lock.unlock();
                }

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